Actor Tom Hanks recentlyy debuted a typewriter app for iPads called Hanx Writer. Since its release, Hanx has skyrocketed to the top of iTunes as the most downloaded app. In this Tech Minute, CNET's Kara Tsuboi explains the novelty of Hanx and recommends other typewriting apps to download, if you too crave a modern spin on that old fashioned clickety-click of the keys.